Analyzing Network Packets with Scapy
FreePerform in-depth packet analysis for network security.
Free · Opens the source repo
What Analyzing Network Packets with Scapy does
The Analyzing Network Packets with Scapy skill leverages the Scapy library, a powerful Python tool designed for packet manipulation. With this skill, users can craft, send, sniff, and dissect various types of network packets, including TCP, UDP, ICMP, and DNS. It provides an efficient way to analyze pcap files, extract protocol fields, and implement SYN scans, making it an essential tool for security professionals engaged in network forensics and traffic analysis.
This skill is particularly useful for security analysts and incident responders who need to investigate network traffic for anomalies and potential threats. By utilizing Scapy, users can perform detailed examinations of packet structures, compute traffic statistics, and identify unusual patterns such as fragmented packets or malformed headers. The ability to generate structured JSON reports from packet analysis results further aids in documenting findings and sharing insights with team members.
In addition to packet analysis, this skill supports the development of detection rules and threat-hunting queries, making it a valuable resource for Security Operations Center (SOC) analysts. It also assists in validating security monitoring coverage against various attack techniques, ensuring that organizations can effectively respond to and mitigate potential threats in their network environments.
To utilize this skill, users must have Python 3.8 or higher installed, along with the Scapy library and appropriate permissions for raw socket operations. With these prerequisites in place, users can begin their packet analysis tasks efficiently and effectively, enhancing their network security posture.
When to use it
Use this skill when investigating security incidents or conducting authorized network reconnaissance.
When not to use it
It is not suitable for environments where packet analysis is not authorized or where users lack the necessary permissions.
What you can build with it
Incident Response Investigation
Use this skill to analyze network packets during a security incident to identify potential threats.
Traffic Anomaly Detection
Implement this skill to detect unusual traffic patterns, such as SYN floods or DNS exfiltration.
Forensic Analysis of Network Traffic
Utilize Scapy to dissect and analyze pcap files for insights into network behavior and security.
How to install Analyzing Network Packets with Scapy
View source1. Install with the skills CLI
npx skills add mukul975/anthropic-cybersecurity-skills/analyzing-network-packets-with-scapy --agent claude-code2. Or install it manually
Download the skill folder and drop it into ~/.claude/skills/ for all projects, or .claude/skills/ to scope it to one repo. Restart Claude Code so it picks up the new skill.
Anthropic's agentic coding CLI, and the reference implementation of Agent Skills. Drop a skill folder into ~/.claude/skills and Claude Code loads it automatically whenever a task matches the skill's description. Claude Code docs
Inside SKILL.md
Written by mukul975Analyzing Network Packets with Scapy
Overview
Scapy is a Python packet manipulation library that enables crafting, sending, sniffing, and dissecting network packets at granular protocol layers. This skill covers using Scapy for security-relevant tasks including TCP/UDP/ICMP packet crafting, pcap file analysis, protocol field extraction, SYN scan implementation, DNS query analysis, and detecting anomalous traffic patterns such as unusually fragmented packets or malformed headers.
When to Use
- When investigating security incidents that require analyzing network packets with scapy
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
Prerequisites
- Python 3.8+ with
scapylibrary installed (pip install scapy) - Root/administrator privileges for raw socket operations (sniffing, sending)
- Npcap (Windows) or libpcap (Linux) for packet capture
- Authorization to perform packet operations on target network
Steps
- Read and parse pcap/pcapng files with
rdpcap()for offline analysis - Extract protocol layers (IP, TCP, UDP, DNS, HTTP) and field values
- Compute traffic statistics: top talkers, protocol distribution, port frequency
- Detect SYN flood patterns by analyzing TCP flag ratios
- Identify DNS exfiltration indicators via query length and entropy analysis
- Craft custom probe packets for authorized network testing
- Export findings as structured JSON report
Expected Output
JSON report containing packet statistics, protocol distribution, top source/destination IPs, detected anomalies (SYN floods, DNS tunneling indicators, fragmentation attacks), and per-flow summaries.
Frequently asked questions about Analyzing Network Packets with Scapy
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